Retirement Plans - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015 USD ($) Employee	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2008 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension plan contribution				$ 600
Expense of retirement plans	$ 200,000	$ 400,000	$ 400,000
Canadian [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Number of employees covered | Employee	12
Required contributions into Canada Wide Industrial Pension Plan	$ 38,000	$ 30,000
Minimum [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Matching contributions offered to employee	0
Maximum [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Matching contributions offered to employee	$ 2,080